angular - ag-grid does not refresh when using Observables -

i'm trying bind angular-2 ag-grid observable. data in grid shown expected when grid loads first time. following code this:

  this.settingsservice.gen.subscribe(   (settings) => {     this.gridoptions.rowdata = settings;   }); 

i have set grid options in constructor of typescript class in component.

now, when update data observable, see updated changes propagated 'settings' (shown above), grid not refresh new data.

i have tried possible ways refresh grid using gridoptions.api.refreshview(). tried solution given here. unfortunately, none of them worked.

any appreciated. thanks.