Detect That A Button Is Still Blinking?

is there any way to determine if a button is still blinking? because i have programmed it like when the condition is true, the button will light up. This button will stop blinking only when the user clicks on it. Because in my program, each button represents the number of blocks. So if the alarm comes in from the block one and block one button blinks, the user should press on the button to acknowledge the alarm. but while the block one button is blinking,if a new alarm comes in from block 2 before the user click on the button1 to stop it from blinking, button 2 will blink together with button1 because the user has not acknowledged the alarm from button1. Currently, i have written the below code to blink the button. but this one will go with the alarm, that is if the alarm comes in at block 1, the button will lightt up at block one. but when a new alarm comes in at block 2 before the user acknowledge the button1, the button1 will stop blinking and buttton 2 will blink. But i want both buttons to light up. the code is below:

Private Sub Timer3_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer3.Tick
For Each ctl As Control In PictureBox1.Controls

[Code]......