fix(combo-box): resolved error in simple combo box sample (#3871)

Author: Mariela Tihova

src/app/lists/combo/simple-combo-main/simple-combo-main.component.ts

@@ -6,13 +6,13 @@ import { IgxButtonGroupComponent } from 'igniteui-angular/button-group';
 import { IgxButtonDirective } from 'igniteui-angular/directives';
 import { FormsModule } from '@angular/forms';
 
-import { IgxFinancialChartCoreModule } from 'igniteui-angular-charts';
+import { IgxFinancialChartCoreModule, IgxFinancialChartModule } from 'igniteui-angular-charts';
 
 @Component({
     selector: 'app-simple-combo-main',
     templateUrl: 'simple-combo-main.component.html',
     styleUrls: ['simple-combo-main.component.scss'],
-    imports: [IgxSimpleComboComponent, FormsModule, IgxButtonGroupComponent, IgxButtonDirective, IgxFinancialChartCoreModule]
+    imports: [IgxSimpleComboComponent, FormsModule, IgxButtonGroupComponent, IgxButtonDirective, IgxFinancialChartModule, IgxFinancialChartCoreModule]
 })
 export class SimpleComboMainComponent implements OnInit {
     public data: StockData[] = updatedStockData;