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Checkbox selection not working when using Observables as DataSource

We try to use checkbox selections (using selection settings) combined with a Syncfusion ej2 DataGrid using Observables.

Using the select all functionality then throws the following error:

core.js:4442 ERROR TypeError: this.getData is not a function or its return value is not iterable at Selection.setRowSelection (ej2-grids.es2015.js:9911) at Selection.updatePersistSelectedData (ej2-grids.es2015.js:10045) at Selection.checkSelectAllAction (ej2-grids.es2015.js:10058) at Selection.checkSelectAll (ej2-grids.es2015.js:10090) at Selection.clickHandler (ej2-grids.es2015.js:10307) at Observer.notify (ej2-base.es2015.js:2134) at GridComponent.notify (ej2-base.es2015.js:6972) at GridComponent.mouseClickHandler (ej2-grids.es2015.js:15962) at ZoneDelegate.invokeTask (zone-evergreen.js:402) at Object.onInvokeTask (core.js:27533) 


Is there a way to make this work with Observables? We are using Observables because the DataManager uses raw XmlHttpRequests that are not intercepted by Angular.