VS 2010 - Command Controls From Different Forms

I'm new to vb but acquainted with programming in java, C, and other languages. I'm developing an application and I'm having difficulties at commanding controls from different forms. It's like this: Form1 has some buttons and charts, and in Form2 it's a "Settings" form to select the category and series for the charts. When i close the Form2 I need to activate some controls like buttons in Form1 and the problem is that at run-time I can call functions like this one:

In Form1:
Public Sub EnableButton()
button1.Enabled = True
End Sub
In Form2:
Public Sub BeforeClosing()
Form1.EnableButton()
Me.close()
End Sub

Using breaks I can see that they execute and the properties of the button change but after the close event of Form2, the properties of the button1 control become unchanged. At the global variables I have:
Dim newChart As System.Windows.Forms.DataVisualization.Charting.Chart
At ButtonX_Click i create a new chart and define some properties and in the end i activate the Form2
Private Sub ButtonSettings_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSettings.Click
[Code] .....

So the sequence is:
Form1 Execute: Button_Settings_Click -> initialize chart and Form2.Show()
Happens: Chart Initialized and properties are changed Form2
Execute: Button_OK_Click -> Form1.Button_ShowChart.PerformClick() and Me.Close()
Happens: Sub .PerformClick() executes but values are not changed Form1
Execute: Button_ShowChart_Click -> Add data to Chart
Happens: Chart is found as NULL and properties are lost
Why does the controls properties are lost if they are executed???