Please find the responses for you queries.
1. I have placed the Gallery control inside the DocManager, by default it is docked left and icons in the gallery control laid down vertical. I want if user dock it to the bottom , the icon list should change the orientation to horizantal instead of vertical.
- Gallery control’s items are arranges in Wrap panel manner. You could set the Docking window width to ItemWidth this will reduce the space in gallery control which will automatically arrange the item vertically since it behaves like wrap panel. Now when you dock the window in bottom the dock window height will be automatically reduced there by making the Gallery control arrange the item horizontally according to the space available.
2. I want if user hovers mouse on particular icon, the icon becomes large to show it is currently selected.
-You can achieve this applying custom animation. You can refer our Customized Gallery control sample under the following link.http://samples.syncfusion.com/wpfonlinesb/v22.214.171.124/
You can find the Customized Gallery control sample under Gallery index in above mentioned link. Here we are providing an item rotate animation in this sample. Similarly you can implement your zoom animation.
3. Also I noticed a crash in Gallery control sample which is included in the syncfusion setup. I also observed this crash ( Null reference exception ) while using the Gallery control. Please let me know if it is the existing bug of syncfusion?
-We tested our Gallery control sample but we could not reproduce the issue. Could you please provide us some more details like stack trace or replication procedure.
Hope this resolves your query.
Please let us know if you have any other queries.