Here you can see how to set all available buttons for the top toolbar (like TopToolbar.Appearance="Full"
control with TopToolbar.Appearance="Custom"
If you don't want to use the full buttons set, just copy the text below and remove buttons you don't want to see.
Also you can change default values of some properties for any button.
For example, you have code file with customized 'Image properties'
folder and you want to use it for new images inserting.
Just edit the line with the InsertImage
<obout:InsertImage runat="server" RelatedPopupType="CustomPopups.SmallImageProperties, App_Code" />