Hi Hein,
Thanks for your interests in Syncfusion products.
The TabControlAdvWorkspace will get get the corresponding SmartPart object each time you call the Hide(Control smartPart); function. Hence, the tab which is added through the Initialization code will not be hidden. For better usage, you can intialize this tab too along with the other child tabs.
Please let me know if you still find difficulties in this query. If so can you please provide me a simple sample to work on your exact requirements to help you out.
Also you can download the latest beta version of CAB kit from the following locations,
Syncfusion SCSF CAB kit -
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http://www.syncfusion.com/Product/uploads/v5.2.0.25-Signed_2c100d6c.zipSyncfusion CAB kit -
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http://www.syncfusion.com/Product/uploads/v5.2.0.25-UnSigned_acfaa8a8.zipPlease test with these, as this contains lots of bug fixes in DockableWorkspace and TabControlAdvWorkspace. Please test it and let us know about your feedback to reduce the bugs further. Let me know if you want any more details.
Thanks,
Fahad