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I have a property grid with a category containing CExtGridCellBool cells displayed as check boxes. I want to be able to programatically check all the items in the category or clear the items. I added custom buttons to the property grid toolbar and in my overriden OnCmdMsg handler I do the following to enumerate and check all the items:

CExtPropertyStore* store = PropertyStoreGet();
CExtPropertyItem* myCat = store->ItemGetByName(_T("Category"));

if ( myCat != NULL )
{
int nItems = myCat->ItemGetCount();
for ( int idx = 0; idx < nItems; ++idx )
{
CExtPropertyItem* item = myCat->ItemGetAt( idx );
if ( item != NULL )
{
CExtGridCellBool* pValue =
STATIC_DOWNCAST(
CExtGridCellBool,
item->ValueActiveGetByRTC( RUNTIME_CLASS(CExtGridCellBool) )
);
pValue->DataSet(true);
}
}
}

This does not work. What is the proper way to programatically set the values?

The CExtPropertyGridCtrl class is designed to be a container for one or more tree grid windows ( CExtPropertyGridWnd-derived classes) displaying the content of the property store. The tree grid windows contain copies of grid cells stored in the property store. When some grid cell changes in the active tree grid window inside the property grid control, then all the grid cells in the in-active tree grid windows and property store get automatically synchronized. If you programmatically change active grid cells in some property values inside the property store, you should finally invoke the CExtPropertyGridCtrl::PropertyStoreSynchronize() method to synchronize all the grid cells in the tree grids.