Constructs a CSplitButton object. The constructor's parameters specify a submenu that is displayed when a user clicks the drop-down arrow of the split button control.
CSplitButton();
CSplitButton(
        UINT nMenuId, 
        UINT nSubMenuId
)
CSplitButton(
        CMenu* pMenu
)
Parameters
| Parameter | Description | 
|---|---|
| [in] nMenuId | The resource ID of the menu bar. | 
| [in] nSubMenuId | The resource ID of a submenu. | 
| [in] pMenu | A pointer to a CMenu object that specifies a submenu. The CSplitButton object deletes the CMenu object and its associated HMENU when the CSplitButton object goes out of scope. | 
Remarks
Use the CSplitButton::Create method to create a split button control and attach it to the CSplitButton object.
Requirements
Header: afxcmn.h
This method is supported in Windows Vista and later.
Additional requirements for this method are described in Build Requirements for Windows Vista Common Controls.