TB_ADDSTRING  M53Z_4 

The TB_ADDSTRING message adds a new string to the list of strings available for a toolbar.

TB_ADDSTRING

wParam = (WPARAM) (HINSTANCE) hinst;

lParam = (LPARAM) MAKELONG(idString, 0);

Parameters

hinst

Handle to the module instance with an executable file that contains the string resource. If idString points to one or more strings to add, this parameter is zero.

idString

Resource identifier for the string resource, or the address of a buffer that contains one or more null-terminated strings to add to the list, depending on the value of hinst. The last string must be terminated with two null characters.

Return Values

Returns the index of the first new string if successful or  - 1 otherwise.