How to have multiple dialogs in a single fragment - sapui5

Question

I have been working on dialog in fragment , for a sample :
test.fragment.xml :
<core:FragmentDefinition
xmlns="sap.m"
xmlns:f="sap.ui.layout.form"
xmlns:core="sap.ui.core">
<Dialog title="P Selection" id='TestDialog1'>
<content>
<f:SimpleForm id="SimpleFormDisplay354"
minWidth="1024"
maxContainerCols="2"
editable="false"
layout="ResponsiveGridLayout"
title=""
labelSpanL="3"
labelSpanM="3"
emptySpanL="4"
emptySpanM="4"
columnsL="1"
columnsM="1">
<f:content>
<Label text="DC" />
<Select id='Test1DCId'
forceSelection="false"
items="{
path: '/P/DC',
sorter: { path: 'Name' }
}">
<core:Item key="{key}" text="{value}" />
</Select>
<Label text="Quantity" />
<Select id='Test1Quantity'
forceSelection="false"
items="{
path: '/P/Quantity',
sorter: { path: 'Name' }
}">
<core:Item key="{key}" text="{value}" />
</Select>
</f:content>
</f:SimpleForm>
</content>
<buttons>
<Button text="OK" press="onTest1OkButtonPress" />
</buttons>
<buttons>
<Button text="Cancel" press="onTest1CancelButtonPress" />
</buttons>
</Dialog>
</core:FragmentDefinition>
In test.view.xml:
The view part when I want to open a dialog is as:
<m:Select id="Gu" items="{/Gu/GList}" change="onTestPress">
<c:Item key="{key}" text="{value}" />
<m:layoutData>
<l:GridData span="L2 M2 S2"/>
</m:layoutData>
</m:Select>
In test.Controller.js:
onTestPress: function () {
this.ADD = 'Yes';
if (!this.byId("TestDialog1")) {
this._oDialog = sap.ui.xmlfragment("test", this);
this.getView().addDependent(this._oDialog);
}
this._oDialog.open();
},
here in similar way may I how can I use multiple dialogs in the same fragment ? Is this possible ?
I have tried as giving another dialog with different ID TestDialog2 ,
And in view some test button and on press , i need to open a Dialog and i tried as:
onTestButtonPress: function () {
this.ADD = 'Yes';
if (!this.byId("TestDialog2")) {
this._oDialog1 = sap.ui.xmlfragment("test1", this);
this.getView().addDependent(this._oDialog1);
}
this._oDialog1.open();
},
But this doesn't work as expected also Throws error Error: Error: adding element with duplicate id.....
I have searched Doc's and many examples but i have been stuck finding an example which shows this use case......
Any help or a sample or a guiding link is much appreciated , TIA