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Standard Bindings like text bindings are updating accordingly in the views( via INotifyPropertyChanged), however when the observablecollection which also implements INotifiyPropertyChanged changes it's not triggering the view.
Note I'm updating the view in the detail section of the MasterDetailPage.
Also worth mentioning: I use xaml markup with the binding reference set in xaml not in code.
solved by myself
The problem was due to 2 problems:
1. Apparently the method wasn't invoked on the main UIthread for this --> Device.BeginInvokeOnMainThread was the solution
2. en secondly the RaisePropertyChanged(() => Clientsgrouped) conflicted with my own method (onPropertyChanged)for the single bindings aolution for this was using my own method --> OnPropertyChanged("ClientsGrouped")
Thanks for your help anyways! You've set me in the right direction!
As per comment 2, I am going to close this issue.