c# - GroupBox autosize

Question

Take a GroupBox, put let say Label inside and then set AutoSizeMode = GrowAndShrink and AutoSize = true.

Two problems will arise:

• There is a huge gap between Label and bottom of GroupBox (almost enough to fit another Label lol);
• AutoSize doesn't respect the GroupBox.Text property.

Question is how to make GroupBox.AutoSize working properly? Properly means: minimum Width should be enough to fit GroupBox.Text, there should be no gaps below for unknown reason (it's not Margin, nor Padding and it looks pretty ugly).

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I've tried to measure string length in OnPaint and setting MinimumSize right there. It works, but I have doubts about this, as if I would want to actually set MinimumSize later - it will be lost after repaint.

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Update, here is screenshot:

Answer 1

You can get rid of the unwanted yellow space at the bottom by deriving a new class from GroupBox that adjusts the bottom edge a bit. In VB something like ...

Public Class BetterGroupBox
    Inherits GroupBox

    Public Overrides Function GetPreferredSize(ByVal proposedSize As Size) As Size
        Dim ns = MyBase.GetPreferredSize(proposedSize)
        Return New Size(ns.Width, ns.Height - 15)
    End Function

End Class