How to set focus on a TextField

[lamotuab]

I have the two TextFields defined per below. When the button in displayAmount is clicked, displayAmount.Text is copied to editAmount.Text and the latter becomes visible in place of the former. However, I cannot seem to set the focus and cursor position for editAmount and the border colour does not change until I click into the field. Is there a way to set its focus when making it visible?

    <Grid>
        <material:TextField
            Grid.Row="0"
            x:Name="editAmount"
            AllowClear="False"
            HorizontalOptions="Fill"
            IsVisible="False"
            Keyboard="Numeric"
            TextChanged="OnEditTextChanged"
            Title="Amount"
            Unfocused="EditAmount_Unfocused">
            <validation:RequiredValidation />
            <validation:RegexValidation Message="Enter a valid amount up to 2 decimal places." Pattern="{x:Static constants:Validations.REGEX_AMOUNT}" />
        </material:TextField>
        <material:TextField
            Grid.Row="0"
            x:Name="displayAmount"
            AllowClear="False"
            HorizontalOptions="Fill"
            IsReadOnly="True"
            IsVisible="True"
            Text="{Binding Amount, Source={x:Reference this}, Converter={StaticResource NumberFormatter}, ConverterParameter='#,##0.00'}"
            Title="Amount">
            <material:TextField.Attachments>
                <Button 
                    Clicked="OnEditButtonClicked"
                    ImageSource="{StaticResource EditIconImageSource}"
                    Text="" />
            </material:TextField.Attachments>
        </material:TextField>
    </Grid>