Hide column or row when content is not visible - xaml

Question

I have an XAML Grid with columns and I would like to hide or collapse the column when the content is not visible.
Example:
I have this layout:
<Grid >
<Button Grid.Column="0" x:Name="FirstButton" Text="First button" />
<Button Grid.Column="1"x:Name="SecondButton" Text="Second button" />
</Grid>
When FirstButton is not visible I want this result
<Grid >
<Button Grid.Column="1"x:Name="SecondButton" Text="Second button" />
</Grid>

Answer 1

Answering myself :
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding Path=IsVisible, Converter={StaticResource IsVisibleToGridLength}" BindingContext="{x:Reference FirstButton}" />
<ColumnDefinition Width="{Binding Path=IsVisible, Converter={StaticResource IsVisibleToGridLength}" BindingContext="{x:Reference SecondButton}" />
</Grid.ColumnDefinitions>
<Button Grid.Column="0" x:Name="FirstButton" Text="First button" />
<Button Grid.Column="1"x:Name="SecondButton" Text="Second button" />
</Grid>
And for the converter part
class IsVisibleToGridLengthConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo language)
{
try
{
GridUnitType t = GridUnitType.Star;
if (parameter != null)
{
Enum.TryParse<GridUnitType>((string)parameter, true, out t);
}
if (value != null)
{
bool d = (bool)value;
return d == false ? new GridLength(0,GridUnitType.Absolute) : new GridLength(1, t);
}
return null;
}
catch (Exception exp)
{
return null;
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo language)
{
return null;
}
}
And Obviously the App.xml part
<Application x:Class="MyNameSpace.App"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:class="clr-namespace:MyNameSpace.Class;assembly=MyNameSpace"/>
<Application.Resources>
<ResourceDictionary>
<class:IsVisibleToGridLengthConverter x:Key="IsVisibleToGridLength"/>
</ResourceDictionary>
</Application.Resources>
</Application>
Hope it helps !!