Does mexican citizen living in mexico have to pay tax to mexico on capital gains made in u.s. stock market.?

foreigners can open brokerage accounts here in u.s. and I already know that the u.s. does not charge tax on non citizens living outside the u.s. and who invest in stock market here. but will their home country charge a capital gain on investments. in this case mexico. and if so, what percentage?
same question in spanish..
un ciudadano mexicano (viviendo en Mexico) tiene que pagar impuestos a Mexico en ganacias de inversiones fuera de mexico? (bolsa de valores in E.E.U.U) y si es que cobran, cuanto es lo que se tiene que pagar? que porcentaje de la ganancia de la inversion?

writing paper on global investments and how countries tax their own citizens.

The US has tax treaties in place with most major countries, and tax policy towards non residents with US brokerage accounts will vary according to what has been agreed with that country. For example, I am a UK citizen with an account in the US. Part of my dividend income is witheld by the IRS and I also have to pay a percentage to the UK tax authority. I don't pay any capital gains to the US, but I do pay capital gains to the UK.

In summary, the position in Mexico is that the non-resident would only be taxed on income that is sourced from Mexico. If you are a resident you will be taxed on worldwide income or capital gains, regardless of source.

Mexico Connect "TAXES IN MEXICO"
http://www.mexconnect.com/business/mex20...

"Non-residents are taxed only on their Mexican source income, usually at flat rates applied separately to different types of gross income
without deductions. However, under special rules they may elect to be taxed at higher rates on net taxable profits from sales of real property or shares or on short-term construction, installation,
erection and similar work. No overall annual return is required of non-residents."

"Taxes in Mexico"
http://www.solutionsabroad.com/d_taxesme...

"Resident individuals are subject to Mexican income tax on their worldwide income, regardless of their nationality. Non-residents, including Mexican citizens who can prove residence for tax purposes in a foreign country, are taxed only on their Mexican source income.

The Federal Tax Code provides that a foreign individual will be considered a resident of Mexico for tax purposes when he has established his home in Mexico, unless he has been physically present in a foreign country for more than 183 days, consecutive or not, in one calendar year, and is able to prove residence for tax purposes in
that other country."

Capital Gains--

"Residents of Mexico are taxed on their worldwide capital gains, whereas non-residents are only subject to Mexican tax on gains arising
from sales of real property located in Mexico or non-exempt sales of shares of Mexican companies, regardless of where the sale takes
place."

Investment taxes on dividends, etc., would only be taxed if they are from Mexico.

"Investment income
Residents are required to include investment income in their annual returns, except for: (a) interest from the Mexican banking system and
government obligations, which is either subject to a final withholding tax of 20% on gross interest (or a portion thereof) or is exempt; (b) dividend income from Mexican corporations or investment funds; and (c) capital gains on transactions carried out through the Mexican stock exchange, which are exempt."