C# winform check if control is physicaly visible

Question

Is it possible to determine if at least one pixel of a control can be seen (by a property or maybe using event notification).

NB : I am not looking for the Visible p

Answer 1

You may use Layout event of controls. it is triggered when control comes to screen and tries to layout its child controls.

For example, let's say there is GroupBox inside a TabPage.
When relevant tab clicked, layout event will fire for first tabpage then for GroupBox
You may use it combined with visibility property