We have strange problem with Editor control .
We draw a cad drawing on the editor (by code) and all thing is ok .
In the editor , when we drag the drawn image , some dashed style lines views become corrupted .
for example , if I click in spot A and drag or I click on element B, the corruption occurs . but if I click and drag in spot C nothing occurs and views stay OK.
Ok state :

views corrupted state :

yellow dashed style lines view corrupted and some lines disappears .