for the first issue we'd need to inspect your master page and css, so please send it to use.
As for the second question, the right hand menu (toolbox) contains controls, so in order to add a new control to it, you will need to click on the "Upload a control" button and upload a User Control or a Custom Control.
I hope you'll find this information helpful. Let us know if there is anything else we can do for you.
All the best,
the Telerik team
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