Aldo,
There are two types of custom button, client side or server side. The server side will trigger a postback. Please check the following two examples:
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How to create a custom button(client side) which displays a dialog?( C# | VB )
This example demonstrates how easy it can be to add your own client side buttons to the CuteEditor by creating a Cross Browser Modal Dialog Box.
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How to create/register a custom button (Server Control) so that it can be used in the template?( C# | VB )
This example demonstrates how easy it can be to add Server Controls to the CuteEditor and register it into Cute Editor toolbar.
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I think for your situation, you should go with the first example. You can find the source of this example in the download package.
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