c# - UserControl with generic control - broken in designer -

i have winform-usercontrol generic type control. create instance, changed designer code:

public class timebarform<t> : t : timebarpanel {     protected void initializecomponent()     {         // ...         this.m_timebarpanel = (t)activator.createinstance(typeof(t));         // ...     } } 

this works fine @ compile time on design time it's broken. on timebarform:

failed parse method 'initializecomponent'. parser reported following error  'type parameters not suppported parameter name: typesymbol'.  please in task list potential errors. 

the derived classes show default designer empty user control.

i tried pass type in constructor vs complains should not touch autogenerated code (it dosn't if-conditions). want generic usercontrol can decide specialization of abstract class/control in derived type , should still able use designer in base class. i'm open other suggestions solve this might not best solution. i'm not used usercontrol-design.

vs 2015/ .net 4.6

i've done dirty workaround can use designer base , derived classes. removed generic , replaced activator-class call constructor. when i'm done designing base class coment line. derived classes call constructor pass instance:

    public timebarform(timebarpanel timebarpanel)     {         this.m_timebarpanel = timebarpanel;         initializecomponent();     } 

to make designer derived classes happy, second constructor provides default instance:

    public timebarform()     {         this.m_timebarpanel = new timebarpanel();         initializecomponent();     } 

not pretty can live it.