Green marks on controls

[odrap]

On my ms Access form in design mode i see that some controls have a small green rectangle on the upper leftconer of the control. What's the meaning of this ?

 

[John Big Booty]

It generally means a label is not associated with a control. If you click on the label, you will a yellow diamond with an exclamation mark will appear, if you hover over the diamond you will get a drop down list with a number of options.

 

[odrap]

I like to thank you for the help