<SfProgressButton CssClass="buttonExecute" @ref="buttonExecuteQuery" Content="@Translator.Translate( BG.Loading )" OnClick="@onExecuteClick">
<ProgressButtonSpinSettings Position="SpinPosition.Right" ></ProgressButtonSpinSettings>
</SfProgressButton>
The OnClick goes blue and can not attack event handler.
if I remove the @ - the page render will crash after start.