The style sheet class name for panel titles is:
<td class="dialog_header_text" valign="middle">
<GEN:HTML NAME="CategoriesDialogTitle" />
</td>
In the Style.css file, you will notice:
.dialog_header {
background-image: url(../Images/dialogHeaderT.gif);
background-repeat: repeat-x;
height:28px;
}
.dialogHeaderEdgeL {
background-image:url(../Images/dialogHeaderEdgeL.gif);
background-repeat: repeat-y;
width: 30px;
height: 30px;
}
.dialogHeaderEdgeR {
background-image:url(../Images/dialogHeaderEdgeR.gif);
background-repeat: repeat-y;
width: 30px;
height: 30px;
}
The background image attribute is what defines the control title's header. To change the header, change the background-image attribute in the Style.css file.
Customizing the Application Style Sheet