if you use ACAD 2004, Please see the file acad.mnu.
for example:
......
***TOOLBARS ......
**TB_TOOLS ID_TOOLS [_Toolbar("TOOLS", _Floating, _Show, 1, 1, 1)] ID_CLRSCR [_Button("Clean the dased line", "rapid16.bmp", "rapid24.bmp")]^C^C^P(LOAD"CLRSCR") CLRSCR ^P ID_SUMLEN [_Button("Sum line", "GETLEN16.bmp", "GETLEN24.bmp")]^C^C^P(LOAD"SUMLEN") SUMLEN ^P
......
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