vb.net - ListChanged Event not firing? -

i have class bindinglist(of t) in it. bindinglist bound datagridview on form. when items added bindinglist, show in datagridview scrollbar never changes accommodate new data. starting think because listchanged event isn't being fired (or captured form). have code set this:

data class:

public class data      implements inotifypropertychanged     public sub new(byval att1 string, byval att2 string)        attribute1 = att1        attribute2 = att2      end sub      private mattribute1 string     public property attribute1 string                     return mattribute1         end         set(byval value string)             mattribute1 = value             onpropertychanged("attribute1")         end set     end property     private mattribute2 string     public property attribute2 string                     return mattribute2         end         set(byval value string)             mattribute2 = value             onpropertychanged("attribute2")         end set     end property      public sub onpropertychanged(byval name string)          raiseevent propertychanged(me, new propertychangedeventargs(name))     end sub      public sub changedataformat()         'change 1 format other     end sub end class 

data generator class:

public class datagenerator()     private mythread new system.theading.thread(address of startdatageneration)     public sub new()         mdatalist = new bindinglist(of data)         mdatalist.raiselistchangedevents = true     private withevents mdatalist bindinglist(of data)     public readonly datalist bindinglist(of data)                     return mdatalist         end     end property     private sub startdatageneration()         dim att1 integer = 1         dim att2 integer = 2         integer = 0 1000             mdatalist.insert(0,new data(att1.tostring,att2.tostring)             att1 *= 2             att2 *=3         next     end sub     public sub startdatathread()         mythread.start()     end sub     public sub changedataformat()         each d data in mdatalist             d.changedataformat()         next     end sub end class 

form:

public class form1     private mygenerators new bindinglist(of datagenerator)     private mydatagrids new bindinglist(of datagridview)     private form1_load(byval sender object, byval e system.eventargs) handles mybase.load           dim numberofgenerators integer = convert.toint32(my.settings.cranecount)           integer = 1 numberofgenerators               dim newgenerator new datagenerator()               dim newtab ne tabpage(i.tostring)               dim newgrid new datagridview               newtab.controls.add(newgrid)               newgrid.datasource = newgenerator.datalist               mygenerators.add(newgrid)           next     end sub     private sub buttonstart_click(byval sender system.object, byval e system.eventargs) handles buttonstart.click         each generator datagenerator in mygenerators              generator.startdatathread()          next     end sub     private sub buttonchangeformat_click(byval sender system.object, byval e system.eventargs) handles buttonchangeformat.click         each generator datagenerator in mygenerators              generator.changedataformat()          next    end sub end class 

i know there lot of code wanted clear. when click start button new items start appearing, however, once bottom of grid scroll bar doesn't appear. if click change format button data changes format , updates in grid properly. under impression listchanged event automatically work bindinglist , datagridview. tried calling update , refresh on mydatagridview , setting datagridview.datasource nothing , datalist.

am missing something?