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Use of Dialog Windows in Advanced Custom Studies
A custom study creation of windows and dialog windows through the operating system API functions can be done. In the case of dialog boxes on the Windows operating system, refer to Dialog Boxes.

Any programming help in this area is not within the scope of this documentation. It is up to you and your abilities to do that type of development if you require. It is possible but outside the scope of any documentation provided here.

An Advanced Custom Study within Sierra Chart, creating what is known as a "modal" dialog window must never be done and is not supported. These types of windows require the user to press a button to save the settings and close the dialog window before processing continues after the creation of this type of window. This will cause serious malfunctioning in Sierra Chart when that dialog type window is displayed from an Advanced Custom Study.

What will happen is that once that window is displayed, there will be a call back into the study function over and over again until there is a stack overflow. Sierra Chart will then abnormally shutdown at some point.

ACSIL Programming Concepts: Use of Dialog Windows in Advanced Custom Studies