Defines, whether a table column will be fixed or not.
If property values is set to Left, then column is pressed to the left table border and is fixed.
If property values is set to Right, then column is pressed to the right table border and is fixed.
If value is set to None, then column is displayed in regular way.
If property is set to Left or Right for a column in group, then column is moved to the upper level of table and is fixed as stated above.
Calling the server is required on client property modification.