The Enable-Disable Parameters dialog box is opened when you click on the Enable/Disable button in the Tuning Panel in the Graph tab. This dialog box allows you to select variables for Tuning. A list of all the variables in your project appears, if you wish to tune a variable, select the checkbox for that variable. If you do not wish to tune the variable, clear the checkbox. You may select all of the variables by clicking on the Enabled checkbox at the top of the dialog box. When you click on OK to close the dialog box and apply the changes, a slider bar appears in the Tuning panel for any variable which is selected in this dialog box.