CheckedChanged not showing in xaml

[FernandoMrq]

i have trying to use CheckedChanged, but it only appers in c#, in the xaml not the sane is not regonized.

my namespace

xmlns:xlf="clr-namespace:Messier16.Forms.Controls;assembly=Messier16.Forms.Controls"

the use
<xlf:Checkbox Checked="{Binding Aselecao}" WidthRequest="20" HeightRequest="20" IsEnabled="False" CheckedChanged="onChangeCheckbox"/>

the error

No property, bindable property, or event found for 'CheckedChanged', or mismatching type between value and property.