RAD Studio VCL Reference
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Displays a toolbar button's drop-down menu.
function CheckMenuDropdown(Button: TToolButton): Boolean; dynamic;
__fastcall Boolean CheckMenuDropdown(TToolButton Button);
CheckMenuDropdown is called automatically when the drop-down arrow portion of a toolbutton is clicked or if a toolbutton has an assigned MenuItem property.
Button is the drop-down toolbar button that was clicked.
CheckMenuDropdown has no effect unless the button's Style property contains tbsDropDown.
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