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Fix issue 14025: [DarkMode] the item lost dot line when using the mouse to expand the dropdown panel for SelectionPanelRadioButton #14710

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Fix issue 14025: [DarkMode] the item lost dot line when using the mouse to expand the dropdown panel for SelectionPanelRadioButton #14710

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ee8a878
Fix issue 14025: [DarkMode] the item lost dot line when using the mou…
Jul 7, 2026
17659c6
Handle feedback
Jul 7, 2026
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20 changes: 20 additions & 0 deletions ...m.Windows.Forms.Design/src/System/Drawing/SelectionPanelBase.SelectionPanelRadioButton.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,26 @@ public SelectionPanelRadioButton()

protected override bool ShowFocusCues => true;

protected override void WndProc(ref Message m)
{
base.WndProc(ref m);

if (m.MsgInternal != PInvokeCore.WM_PAINT || !Focused || !ShowFocusCues)
{
return;
}

Rectangle focusBounds = ClientRectangle;
focusBounds.Inflate(-LogicalToDeviceUnits(3), -LogicalToDeviceUnits(3));
if (focusBounds.Width <= 0 || focusBounds.Height <= 0)
{
return;
}

using Graphics g = CreateGraphics();
ControlPaint.DrawFocusRectangle(g, focusBounds, ForeColor, BackColor);
}

protected override bool IsInputKey(Keys keyData) => keyData switch
{
Keys.Left or Keys.Right or Keys.Up or Keys.Down or Keys.Return => true,
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