This callback is fired when the user changes a parameter value in a property page control (for example, by selecting an item from a drop-down list, changing the value in a field, or selecting a check box).
Note that changing the contents of a list box (setting PPGItem.UIItems property) does not trigger an OnChanged callback.
To access the property page from the callback code, use the PPG object.
Custom Properties implemented in a scripting language.
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function <property_name>_<parameter_name>_OnChanged()
{ 
        ... 
}
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def <property_name>_<parameter_name>_OnChanged():
        ...
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Function <property_name>_<parameter_name>_OnChanged()
        ...
End Function
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sub <property_name>_<parameter_name>_OnChanged 
{ 
        ... 
}
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<property_name> is the name specified in the call to PluginRegistrar.RegisterProperty, with any spaces converted to underscores. For example, if you register a property with the name "My Property", the callback function names start with "My_Property".
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// Enable/disable a text box based on the state of a check box
function MyProperty_MyCheckbox_OnChanged( )
{
 var bFlag = PPG.MyCheckbox.Value;
 // If the check box is cleared, disable the text box
 if ( bFlag == false )
 {
     PPG.MyTextBox.ReadOnly = true;
 }
 else
 {
     PPG.MyTextBox.ReadOnly = false;
 }
 PPG.Refresh()
}
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