Question: Context menu not appear after using assume() ?

After I excute : x^2+2*x+1;   and right click on the output then I saw the CompleteSquare option in the Context Menu but after I write  assume(x>0); and then right click on the output of x^2+2*x+1; then I didn't see this option (and there are only a few options appeared in the Context Menu compared to the case before using assume()). 

Sometimes It cause some inconvenience for me since I used Context Menu on outputs from previous lines in my worksheet which used to have some assumptions.

Anyone have any idea?



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