clear variable location cell in variable panel, if variable class or type changed
if variable class is not local or global, or variable type is not locatable, variable location cell would be empty and read-only
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<!-- generated by wxGlade 0.6.8 on Thu Jun 18 15:19:02 2015 -->
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<style>wxCAPTION|wxCLOSE_BOX|wxMINIMIZE_BOX|wxMAXIMIZE|wxMAXIMIZE_BOX|wxSYSTEM_MENU|wxRESIZE_BORDER|wxCLIP_CHILDREN</style>
<title>frame_1</title>
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<object class="ThreeDee" name="window_1" base="CustomWidget">
<extracode># WHERE IS THAT ?\nprint "hello"\n</extracode>
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<object class="sizerslot" />
<object class="sizerslot" />
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<object class="wxToggleButton" name="DrawTestBt" base="EditToggleButton">
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<property name="Name">"DrawTest"</property>
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<extraproperties>
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