TouchToolKit for WinForms | ComponentOne
Zooming Component / C1Zoom Elements / C1Zoom Control Bar Element / Control Bar Transparency
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    Control Bar Transparency
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    You can set the color that will represent transparent areas of the ControlBar(UserControl) by using the ControlBar.DefaultTransparencyKey property. The property is enabled if the ControlBar.TransparentBackground property is set to True.  In the transparent mode, users cannot operate the controls on the Form behind through the transparency.