Using on a MDI Child form

What steps will reproduce the problem?
1. Create a second form on the test project (TestApp or TestVb).
2. Mark the second form as a mdicontainer & the default form.
3. Open the original form, setting it's MdiParent to be the new second form 
above.

What is the expected output? What do you see instead?
It appears the DefaultApplicationId is getting lost in the mix of the window 
handle.  I cannot figure out how to run it on a MDI Child form.  This line 
always returns a NULL DefaultApplicationId '_dataSourceManager = new 
DataSourceManager(DataSourceManager.DefaultApplicationId, messageHook);'.  I am 
guessing it sees the mdiParent form's handle instead.

What version of the product are you using? On what operating system?
TwainDotNet source code 2011-12-22
Windows 7 64-bit

Please provide any additional information below.
It works fine on a regular form.  Awesome project by the way!

Original issue reported on code.google.com by hol...@gmail.com on 4 Feb 2013 at 7:02

Tattakashi123 / t

Using on a MDI Child form #54