adjust style
adjust popup position and hover style in toolbar mold
fix icon
to avoid line height overwrite by caption
Merge branch 'update-combobutton' of git://github.com/huangnoah/zk into 7.0
Merge branch 'update-groupbox' of git://github.com/huangnoah/zk into 7.0
Merge branch 'update-panel' of git://github.com/huangnoah/zk into 7.0