.Net Form Activate/Deactivate Event Firing Issue After Removing A TabPage From TabControl?
Nov 28, 2011
I've recently run into an unexplainable issue regarding a windows form application I am working on. I've managed to isolate the issue to a single line of code whereby a single TabPage is removed from a TabControl, leaving no tabs left in the TabControl's collection. What happens next is a bit mystifying: my application proceeds to enter a state in which the main form's Activate event is fired subsequently followed by its Deactivate event. As a result, no matter where I click on the form, the application will activate for a split-second then immediately deactivate itself, thereby causing me to be unable to interact with any other GUI controls on the form. I thought maybe another thread is trying to interact with the deleted tab object, but the tab is created and destroyed on the same main gui thread. Does anyone have any insight that may point me in at least a new direction? Stepping through the debugger to the point in code where the tab is removed does not cause any exception to get thrown, so at first glance there doesn't appear to be any coding issues going on (although I would not be surprised that is actually the case!).
View 3 Replies
ADVERTISEMENT
Jul 22, 2011
I am using VB.Net for my Windows application. I will open two child form from MDI. Both forms will open. Now if I will go from form1 to form2 then Activate event for form2 will not fire.
View 1 Replies
Jul 23, 2010
We have a VB 2 VB.Net migration MDI application , we have a messagebox in Deactivate event ,once you click Ok for Message Box ,the focus must be set on to the Child Form which is active.
[Code]...
View 6 Replies
Mar 11, 2010
i hav a tabpage on a form n on its click event i want to call the tabpage of another form (like frmcut.tabcontrl.tabpage1). But i dont know how to do it?
View 4 Replies
Apr 21, 2011
I am already overriding the SnapLines property in my ControlDesigner-derived class to manually forward out various snaplines from the child controls of my control -- the text baseline (pink) snap from the labels and comboboxes; the text inset snap from the labels; the top, bottom, left and right snaplines from the comboboxes. Those snaplines activate when the control itself is moved around on the form and when other controls are moved around it.
What I need is the ability to tell the designer to activate the snaplines and then deactivate them while I'm doing an internal move or resize of the underlying controls.My comboboxes are resizable through overrides of OnMouseDragBegin, OnMouseDragMove, and OnMouseDragEnd in my control designer. The magic bullet I'm looking for is something I can call in Begin to tell the designer to show the snaplines and something in End to tell it to stop.
Allowing people to resize and move the internal controls at design time is kind of useless if they don't show snaplines for each other or for external controls.As with stuff like this, it's incredibly hard to search for. I've found one post on a forum where someone asked this exact question that had (of course) no responses. That's about it.
View 1 Replies
Jun 18, 2011
In my program I've used a text box and KeyPreview is True.When press the Enter-key i hope go to next row but called the default key?
View 2 Replies
Feb 29, 2012
I'm quite new to vb.net and I was trying to develope something that can activate/deactivate the Optical reader at startup, so I wrote:
[Code]...
but obviously it's not that simple, I read I need registry permission not to have access denied to the specified key, I imported the system.security.permission namespace and I tried some constructors but without any results...anyone can point me to the right procedure?
View 2 Replies
Mar 30, 2009
I am using VB.NET for Windows applications. What is the difference between Load event,Activate event and Enter event in the Form and in which order the above event is executed.
View 2 Replies
May 25, 2010
I'm trying to make my application become the active window if it currently isn't as soon as the mouse enters the main form of the application (so there is no need to click the title bar of form itself to make the window the currently active one if it's not).
It only sorta/kinda work .... I have to enter the form with the mouse 3-4-5-6-maybe 7 times ... then the window finally becomes the active one.
I know the MouseEnter event is firing each time the mouse enters the app, but the main window isn't becoming active most of the time.
Private Sub frmMain_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseEnter
rtbStatus.AppendText("Just got a frmMain.MouseEnter event" & vbCrLf)
[Code]....
View 10 Replies
Aug 30, 2009
I get an error when I try to add a tabpage to my tabcontrol.
View 6 Replies
Aug 31, 2011
I'm trying to add a tabPage to an existing TabControl named TabControl4 I went all over it with the Debugger and everything is fine, but it won't show the TabPage in the TabControl. That's the code, Notice all the information being added to the TabPage is retrieved from a database so don't pay any attention to it, plus the software is in Hebrew so just ignore the Hebrew Strings.
[Code]...
View 1 Replies
Nov 9, 2010
I fear that there is something obviously wrong with my code, but I have come across a situation where the Form.Load event is not firing when I create and show my form. The form is not subclassed (as I've seen some problems with that in some searches), and I am not getting any errors thrown when I step through the code in the debugger.
I have a break point set on the IDE-created form load function (which does have the Handles MyBase.Load signature suffix) but the breakpoint is never reached and the form does display and work.The form is passed three arguments in the constructor but the IntializeComponent() function is called before anything else is done.
[Code]...
View 8 Replies
Sep 7, 2009
My form load event is not running. How do I track down the coulpret?davidbell
View 1 Replies
Sep 3, 2009
I have the following code for a gradient form below. When I step through my code it seems to fire constantly. Does this mean that it fires constantly at run-time? If so, is there a way to stop it from firing constantly
Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
Dim Mybrush As New System.Drawing.Drawing2D.LinearGradientBrush(Me.ClientRectangle, Color.LightSkyBlue, _
Color.Snow, Drawing2D.LinearGradientMode.Vertical)
e.Graphics.FillRectangle(Mybrush, Me.ClientRectangle)
End Sub
View 4 Replies
Jun 29, 2010
Sub FrmConfigurationLoad(ByVal sender As Object, ByVal e As EventArgs)
msgbox("TEST")
'load the config data from xml
'Dim doc As New XmlDocument
[code]....
The form loads and nothing happens?
View 5 Replies
Apr 16, 2012
I created a little usercontrol that looks similar to Visual Studios toolbox. It works great in the user control project, but when I import it to a form the MouseLeave Event doesn't work. The MouseEnter event works fine however. Any idea why only the MouseLeave event doesnt work? I did notice that I have to use the Panel controls MouseLeave, MouseEnter events for things to work correctly. The Usercontrol Mouseleave and Mouseenter didn't work at all.
Public Class vsStyleToolBox
Public isPinned As Boolean = False
Public isShowing As Boolean = False
[code]....
View 2 Replies
Nov 22, 2009
how to change the tabpage selected of the tabcontrol by using normal buttons (like button1, button2,button3 and so on). I don't want to use the ugly default buttons at the top of the tabcontrol to change it.
View 4 Replies
Jul 27, 2009
In my form I have a TabControl that has 13 TabPages. I have been able to print the Entire form, but I would like to just print everything in various (not all) TabPages. Each of the TabPages have a several PictureBoxes and several Labels.
Where should I start to simply print the TabPage?
View 1 Replies
Mar 7, 2010
Public Class Form1
Private m_MouseCoords As Point
Private Sub TabControl1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles [code]....
So I was tinkering with my tabpages and removing them with my middle click and I came across a problem:Make a new form with this code and then make a tabcontrol with 8 tabs, run it and click tabpage8 then tabpage7 and then try to remove tabpage4; unfortunately it removes tabpage3.
View 1 Replies
Feb 22, 2012
I've managed adding TextBox-es and Label-s to a TabPage using NumericUpDown control with next method:
[Code]...
View 2 Replies
Sep 10, 2010
I have a login form that when the user clicks OK and logs in successfully it loads the main application form.However when I show the main form and close the login form, the app is firing the shutdown event.Is this because the app thinks that the login form is the only form open and thus fires the shutdown event?Here is the code for the login routine, when I call Me.Close() at the end is when the shutdown event is fired. Am I doing things out of order? I used to do it this way in VB6 with no problems (I know they're a lot different).Note, it's nothing in frmMain either, this happens no matter what form I try to open.
Private Sub btnOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOK.Click
'iLoginResult = 0 : Success
' 1 : Invalid user name or password
' 2 : Other login error
[code]....
View 3 Replies
Mar 3, 2009
In Vb.Net 2005, how is it possible to make the TabPage.Text to appear when the DrawMode of a TabControl is set to OwnerDrawFixed. I have even tried to set the TabPage.Text in the Form_Load event but of no avail.
View 1 Replies
May 1, 2009
I have been tasked with showing a tooltip when I hover over certain TabPages within a tab control, I have tried everything I can think of to resolve this little task, but still I am left with no clear answer.
the events that I would normally use, seem only to fire if the mouse is over the actually tabpage, I am more interested in the tabpage under the mouse in the tabcontrol.
View 3 Replies
Oct 29, 2009
determine if a tabpage of a tabcontrol is being hovered over.I wanna set a property to true if it is hovered over and if it is I will then highlight it.this is what I have
vb.net
Private _MouseHover As Boolean
Public Property IsMouseHovered() As Boolean
Get
[code]....
this clearly will put it over any tab page I need to make the property specific for each tab page.
View 4 Replies
Dec 20, 2011
I have a VB (.NET3.5) project like this:
- form1: IsMDIForm = true.
- form2: adding a list view with 2 records, select first record, and register the event ItemSelectionChanged.
- Add form2 as a child of form1 (form2.MDIParent = form1).
- When use "form2.Show()" -> the event ItemSelectionChanged firing three time:
+ 1st: SelectedItem = 1
+ 2nd: SelectedItem = 0
+ 3rd: SelectedItem = 1
I want to know the rootcause (not Solution) of thi issue, can anyone help me !?
Project code: http://www.mediafire.com/?hhhdzh5te1wrod4
View 18 Replies
Nov 3, 2009
How can I make an event for a tabcontrol which has Tabpage1, Tabpage2, Tabpage3, and so on.. For example... There's a label outside the tabcontrol (Label1). If tabpage1 is selected, how can I make the label1's text changed?
View 1 Replies
Mar 3, 2009
In Vb.Net 2005, how is it possible to make the TabPage.Text to appear when the DrawMode of a TabControl is set to OwnerDrawFixed. I have even tried to set the TabPage.Text in the Form_Load event but of no avail.
View 1 Replies
Nov 19, 2009
I have a application with a tabcontrol. I dynamically open new tabs on which there is a custom control which is made of a graph and a datagridview with data. I fill this from a csv file. when I open few tabs like this my application memory goes over 120 MB. When I remove the tab I call the dispose on the custom control and a dispose for the tab. But the memory stays where it was (120+MB). It goes down only if I minimize the program. And when I show it again its around 10MB.
View 3 Replies
Mar 17, 2009
How do I make a certain tab inside TabControl to be active at form event?
For example, I want TabControl2 to be shown at form load.
TabControl2.focus isn't working.
View 8 Replies
Mar 3, 2009
In Vb.Net 2005, how is it possible to make the TabPage.Text to appear when the DrawMode of a TabControl is set to OwnerDrawFixed. I have even tried to set the TabPage.Text in the Form_Load event but of no avail.
View 1 Replies
