CMFCDropDownToolbarButton::m_uiShowBarDelay
Specifies the length of time that a user must hold the mouse button down before the drop-down toolbar appears.
static UINT m_uiShowBarDelay;
Remarks
The delay time is measured in milliseconds. The default value is 500. You can set another delay by changing the value of this shared data member.
Requirements
Header: afxdropdowntoolbar.h