ngx-modialog vex className have no effect

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const componentContext = { message: 'Hello Modal' };
const dialogRef = this.modal
.open(RoutePrintSummaryComponent, overlayConfigFactory(componentContext));

export class RoutePrintSummaryComponent implements OnInit{
theme: VEXBuiltInThemes = 'default';
constructor(public dialog:DialogRef){
// this.dialog.context.dialogClass = 'modal-dialog modal-lg';
this.dialog.context.className = this.theme;
this.dialog.context.contentClassName = "vex-content";
this.dialog.context.overlayClassName = "vex-overlay";
}

ngOnInit(){

}
onClose(){

}
onOk(): void {
this.dialog.close('Ok');
}
}

[1456118242]

@shlomiassaf