This method was only defined when wxUSE_DIALOG_SIZEGRIP==1 so avoid declaring it when wxUSE_DIALOG_SIZEGRIP==0 to fix compilation in this case (i.e. under Windows CE). Closes #13852. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70317 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775