Properties window now floating- permanently

I know this must be something simple. All of a sudden even though my project windows and toolbox windows are docked (with the option to display when needed) - my properties window is always there - no docking - no minimizing -Ive searched thru the options but I cant find what Ive stuffed up. How can I get it back to what it was - only displayed when needed and hidden when moved away from ???
regards

BH

How I hate those windows...... I use this method to get back to where window where from the beginning....

See to it that dockable is the only option, drag the window in the caption area and drop it over another windows caption area to add it as a tab under that window. Now change it to autohide.

thanks for that - works fine - back to what it used to lool like