I have 2 DropDown Tree controls - one under the other. They have filtering, select all and checkbox activated.
If I open one of them, the second to be opened looses the styles for the filter box.

<div class="control-section">
<div class="content" style="width: 280px;margin: 0 auto; padding-top:15px">
<ejs-dropdowntree
id="filter"
[fields]="fields"
[filterBarPlaceholder]="filterPlaceholder"
[popupHeight]="height"
[allowFiltering]="true"
[placeholder]="watermark"
></ejs-dropdowntree>
</div>
<div class="content" style="width: 280px;margin: 0 auto; padding-top:15px">
<ejs-dropdowntree
id="filter"
[fields]="fields"
[filterBarPlaceholder]="filterPlaceholder"
[popupHeight]="height"
[allowFiltering]="true"
[placeholder]="watermark"
></ejs-dropdowntree>
</div>
</div>
https://angular-hxdtir.stackblitz.io