Thanks Borislav for the explanation.
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>CLEAR ALL
>Releases from memory all variables and arrays and the definitions of all user-defined menu bars, menus, and windows. CLEAR ALL also closes any tables, including all associated index, format and memo files, and selects work area 1. CLEAR ALL also releases from memory all external shared library functions registered with DECLARE - DLL.
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>CLEAR ALL does not release system variables, and does not clear the compiled program buffer. Use CLEAR PROGRAM to clear the compiled program buffer.
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>Issuing CLEAR ALL within an event or method for an active control or object generates a Visual FoxPro error message. An object type variable cannot be released from memory when its associated control or object is active.
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>Easiest way - Do not use CLEAR ALL, untill you close the application