A command button carries out an action. A command usually has a name that describes the action that it carries out. For example, the ‘Charge’ button will Charge the patient for the treatment completed.
To carry out the action described by the name, click on the button with the mouse; the button will be highlighted and the desired operation will be enabled.
To view the tooltip on some buttons
Some buttons use a graphic, rather than a name. If you wish to know what a button’s function is, you can hover the mouse pointer over the button to view its tooltip:
In this case, click the button to "Create An Estimate".
This is what you are currently doing!