Component attribute value is red with # at beginning

[SJS66]

Whenever I create a component (say a simple box) and try to 'fix' it's size in Component Attibutes by typing = in front of the LenX value for example, it turns red with a # in front of the value as in '#=100cm'. What is going on? What am I doing wrong? Can save a file with a component in it that I've tried to fix size and upload file if needed.

[Rich O Brien]

Click to play...

You need to set the LenX to handled by User input to see changes.

[SJS66]

I think I've got one for the next Doh Book. When constraining a component attribute it pays to delete the units from the value. I was leaving the cm in the value box and this is what was causing the #=100 cm in red. Noob I am.