Filter not working

```
<input #gb type="text" pInputText size="50" placeholder="Filter">
<ay-treeTable [value]="files" [globalFilter]="gb">
 <ay-column field="name" header="Name"></ay-column>
 <ay-column field="gender" header="Gender"></ay-column> 
</ay-treeTable>
```

When I enter text in the filter input field and press enter, filter is not working as expected