how to add viewcontrol to a winform

[Anonymous]

hello,i have control application and the main form adds a viewcontrol on it to show the nwd file,it works well.

and i want to crete a new form to view some other files like cad file, etc.

so i add a viewcontrol on the second form,but when i use

NewForm f = new NewForm();

f.showDialog();

the application crashes

so how can i add multiple viewcontrols in one application?

TKS~~~~

[xiaodong_liang]

Hi ,

have you initialized the app as MultiDocument? The API help tells more. In addition, please take a look at  the sample

C:\Program Files\Autodesk\Navisworks Manage 2013\api\net\examples\Controls\Viewers\MDIViewer