ASPxClientHtmlEditor.SetHtml(String) Method

function SetHtml( 
   html : String 
);

<dx:ASPxHtmlEditor ID="ASPxHtmlEditor1" runat="server" 
    ClientInstanceName="htmlEditor">
</dx:ASPxHtmlEditor>
<br/>
<dx:ASPxButton ID="ASPxButton1" runat="server" 
    AutoPostBack="False" Text="ASPxButton">
    <ClientSideEvents Click="function(s, e) {
        htmlEditor.SetHtml('Sample Text');
     }" />
</dx:ASPxButton>