Selenium C# How do I call a method from another class both classes inherit from a base class

I am having trouble seeing the methods from one of the class. I have created a MobileLoginPage class and I want to click the Menu button. I noticed there is already a method defined to click the Menu button from a class called MobileNavigationPage. The method is called ClickMenuNavigation

As this method already exists I should be able to call it from my MobileLoginPage class. Avoid duplicating code. I am not able to call it, when i write the code MobileNavigationLogin. no methods show up. I even tried to call the locator element by defining a method (getMenuNavigationElement) to return the locator. I cannot see this locator from LoginPage class.

The class has been instantiated in the BasePage class, I do not know why I cannot see it's methods.

My code snippet is:

The BasePage is and all of our classes are instantiated here:

public class BasePage : SpecflowBaseTest

{
    internal MobileNavigationPage MobileNavigationPage => new 
    MobileNavigationPage(Browser);
    internal MobileLoginPage MobileLoginPage => new 
    MobileLoginPage(Browser);
}

The MobileNavigationPage is:

public void MobilenavigationPage : BasePage
{
    #region Elements

    [FindsBy(How = How.Id, Using = "MobileMenuNavigation")]
    private IWebElement MenuButton {get; set;}

    #endregion

    #region Actions

    private void ClickMenuNavigation()
    {
        Actions.Click.Element(Browser, MenuButton);

    }

    private IWebElement getMenuNavigationElement()
    {
        return MenuButton;
    }

    #endregion 
}

The MobileLoginPage is:

public class MobileLoginPage : BasePage
{
    # region Actions

    public void ClickBrandFromMenuNavigation{}
    {
        // I want to call ClickMenuNavigation() from here                   
    }

    #endregion
}

From LoginPage class how do I call the method which is defined in MobileNavigationPage?