oops, this is an error, the FIXGRID does not offer an enabled function - it is somehow "by accident" in our tag library definition.
We will take out for next update... Please do not use this attribute, otherwise you will get JSF errors after next update.
Disabling a grid needs to be done on the level of grid rows and functions which e.g. relate to grid selections.
Sorry, for having confused with the ENABLED property...