This will create preloader overlay control.
Object defining html attributes for controls root element.
Callback that will be called when control is clicked.
Object defining css styles for controls root element.
If true control will be enabled if false control will be disabled (inactive).
Reference id of the control, it will be used to reference this control in the code throuth FieldsIndex objects.
If true this control definition will be ignored and control will not be initiated.
Callback that will be called when control is initialised.
Style class to add on root element of the control.
Initial value.
Set initial visibility of control. (default: true)
This will create preloader overlay control.