You should add padding to RadDocks.You can change RadDock_Default class in Skin css file(e.g. C:\Program Files\Telerik\RadControls for ASPNET AJAX Q1 2008\Skins\Default\Dock.Default.css)
For example:
.RadDock_Default {
background:window none repeat scroll 0% 0%;
color:windowtext;
margin:0pt 5px 5px 0pt;
text-align:left;
}
to
.RadDock_Default {
background:window none repeat scroll 0% 0%;
color:windowtext;
margin:0pt 5px 5px 0pt;
padding: 5px 5px 5px 5px;
text-align:left;
}