AX / Dynamics 365 For Finance and Operations blog

You can use extension to enable or disable a Form Control.

In this example I will show how to disable a Form Control button (LineStripNew button) in an extension class od SalesTable Form

[ExtensionOf(formdatasourceStr(SalesTable, SalesTable)) ]

final class SalesTable_SalesTable_DLXFormDS_Extension

{

    public int  active()

    {

        int ret = next active();

        FormControl LineStripNew = this.formrun().design().controlName(formControlStr(SalesTable, LineStripNew)) as FormControl;

        LineStripNew.enabled(false);

    }

}