wpf custom combobox with datagrid but after popup dorpdown the first item is not selected -


i have customed wpf combobox datagrid in it.

after click toggle button of combobox, open dropdown popup , show datagrid image below. cilck toggle buttom show whole result

now question why first item in datagrid in dropdown popup not selected?and if after press down arrow key, select second(like image below press down arrow key right after dropdown shows) item makes me fell first item somehow selected highlight background not shown. focus or else? no idea here , in advance.


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