Thank you for contacting us. From the information shared I believe you are looking for load on demand feature. If this is the case I can suggest to check our load on demand examples in the SDKBrowser demo app (located in the installation folder - C:\Program Files (x86)\Telerik\UI for Xamarin R3 2016\Examples\XamarinForms ).
Please check the samples code and let us know if this helps.
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