I have the handle of a window in an external application, This window has a control type ToolbarWindow32. is possible add a button (or item) in this ToolbarWindow32 control using delphi.
i found a similar sample (This tool allows to alter the order of the window buttons in a ToolbarWindow32) in this link http://www.codeproject.com/KB/shell/taskbarsorter.aspx but using c#.