C# control: Radio button disappears after showing a MessageBox

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C#

user-controls

MessageBox

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Hello,

I have a C# user control.
In this control, I have a GroupBox that includes radio buttons and textboxes.

When the user switches between the radio buttons, a message box is raised to ask the user if he is sure in his selection.

The top of the messagebox is covering the last radio button and the last textbox.
In a case the user selects NOT to apply the radio button changes, the messagebox is getting closed, but the last radio button (that was covered by the messagebox) disappered. (The last textbox that was also covered by the messagebox is not getting disappered).

This is kind of refresh problem, because when I move the mouse button on the place of the last radio button, it appears again and everything is fine. (it appears again also if I minimize and maximize my application, etc).

I tried to run the methods Show() and Refresh() on the last radio button after closing of the messagebox, but it doesn't work.

What else can I do?

Thanks