Go to the Layout tab, double-click any cell. On the Cell dialog, press the Insert Token button. This dialog helps you to assemble a token with its necessary attributes, and insert it into a cell. The dialog lists all of the tokens that can be inserted into a layout. Scroll down and select the <tdbutton> token. The right hand side of the dialog will display the options available for the <tdbutton> token, including "type", which will be a list of all of the available button types.