C#: custom control vs native control

Question

ALL, I am trying to develop a C# Windows Forms application. For that I needed to make a custom control that is derived from the GroupBox.

Now for the problem. I have a form and on the form I put a grid box. On 1 cell I put a GroupBox and on another cell I put my custom control. For both controls properties I put "ColumnSpan" to be 3 as grid has 3 columns. The native control display itself properly, meaning it is stretched. The custom control display itself incorrectly, meaning it is not stretched.

I checked and all properties in the properties inspector are the same.

What am I missing?

Thank you.

Answer 1

For some reason custom controls do not resize themselves. So all I had to do in the GUI designer is to resize the control.

Thank you for reading and hopefully it will help someone else.