Specifies whether the button is selected (down) or unselected (up).
property Down: Boolean;
__property Boolean Down;
When GroupIndex is greater than 0, set Down to true to select a button. When the user clicks on a button in the unselected (up) state, the button is selected and Down is set to true. When the user clicks on a button in the selected (down) state, if Caption is true, the button becomes unselected and Down is set to false.
At design time, specify which button in a group is the initially selected button by setting the Down property of the selected button to true.
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