When i use this code with zk pe 5.0.9 and brezee theme, appear visual bug , not all paints.

Demo
<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<zk>
<window title="new page title" border="normal">
<toolbar orient="vertical">

<toolbarbutton
forward=""
label="Example" />
<toolbarbutton
forward=""
label="Example" />
<toolbarbutton
forward=""
label="Example" />
<toolbarbutton
forward=""
label="Example" />
<toolbarbutton
forward=""
label="Example"/>
<toolbarbutton
forward=""
label="Example" />
<toolbarbutton
forward=""
label="Example" />
</toolbar>
</window>
</zk>