qt - Modify color QTreeWidget -

how change color of every text in qtreewidget (item text, name of column)?

in fact, have qtreewidget inside groupbox , when have modified stylesheet of groupbox, inherited in qtreewidget. so, have modified stylesheet in qtreewidget color: rgb(0, 0, 0);, when execute application, color same groupbox , not stylesheet of qtreewidget (whereas modified in designer).

when set stylesheet qgroupbox this:

qgroupbox{color: red;} 

this way qtreewidget ignore stylesheet.